2 
16 Normentafeln zur Entwicklungsgeschichte der Wirbeltiere. 
Tables. 
Eh oh Size Preparation Data Body Form Somites Head-Somites 
! 
H.E.C Blastoderm | Fixative: Aceto-corrosive. Blastoderm elongately oval in out- — — 
986 3.0 mm. ‚Section: Transverse, 6 u. line, raised a little above the surface 
| Stain: Alum cochineal, safranin. |of yolk. Segmentation cavity forms 
| a small swelling near posterior end. 
| 
H.E.C. | Blastoderm |Fixative: Aceto-corrosive. Blastoderm broadly oval in outline, | —_ ==> 
989 | 42 mm. Section: Sagittal, 6 u. nearly a half longer than preceding 
| | Stain: Alum cochineal, safranin. | specimen. Posterior margin a little 
thickened near median line. 
| | 
H.E.C. | Embryo |Fixative: Aceto-corrosive. Blastoderm broadly oval in outline., — | == 
990 0.3 mm. |Section: Sagittal, 6 u. But little larger than preceding stage. 
Stain: Alum carmine, safranin. | Margin thickened around entire cir- 
cumference. Embryo a rounded thick- 
ening, 0.3 mm. in length antero- 
posteriorly, on posterior rim of blasto- 
| derm. Very shallow rim notch. 
| 
| 
| | 
H.E.C. | Embryo |Fixative: Aceto-corrosive. Embryonic swelling projects forward | Mesoderm of body a pair of|Head mesoderm represented by a 
983 1.4 mm. |Section: Transverse, 6 u. ı mm. from thickened posterior rim lateral plates continuous with |thickening of dorsal wall of arch- 
Stain: Alum cochineal, safranin. | of blastoderm — a little expanded an- | the head mesoderm, narrower |enteron on either side of the noto- 
| teriorly. Shallow rim notch. Well | anteriorly than posteriorly, di- | chordal plate. 
| | defined median furrow which extends | stinctfrom entoderm posterior- 
along posterior two-thirds of swelling. | ly, confluent with it anteriorly. | 
| | 
| | | | 
H.E.C. | Embryo |Fixative: Aceto-corrosive. Embryo extends forward I.2 mm.| Apparently one intersegmental | Like preceding embryo. 
988 | 16 mm. |Section: Sagittal, 6 ». from posterior rim of blastoderm._cletft. 
| | Stain: Alum cochineal, safranin. | Medullary plate ı mm. in length. Fore- | | 
| | gut process extends forward 0.2 mm. | 
| beyond medullary plate. Shallow rim 
| notch. Deep median furrow in pos- 
| | | terior three-fifths of medullary plate. 
HE.C. | Embryo |Fixative: Aceto-corrosive. | Archenteron forms rounded process | Axial mesoderm a pair of late- | Head mesoderm continuous with 
984 1.8 mm. Bar Transverse, 6 u. projecting o.I mm. in front of medul- | ral ridges projecting from roof | archenteron anteriorly, distinct 
| Stain: Alum cochineal, safranin.  lary plate. Medullary plate divided |of archenteron. No somites. | from it posteriorly. 
| into cephalic and chordal portions. | Posteriorly the mesoderm is al- 
Broad shallow rim notch. Median | most completely separatedfrom | 
furrow in posterior five-sixths of plate. |the entoderm. | 
ı Caudal swellings differentiated from | 
posterior rim of blastoderm. 
| 
| 
| | 
| | 
H.E.C. | Embryo Fixative: Aceto-corrosive. Embryo farther raised from blasto- Four pairs of somites — the | Mandibular somite represented by 
1009 2.0 mm. |Section: Sagittal, 6 u. | derm. Anterior swelling of archen- | anterior two well separated. A |an expansion of the anterior end 
Stain: Borax carmine, Lyons |teron hidden by expansion of cephalic fifth somite forming anteriorly.|of head mesoderm. A minute 
| ibiges plate. Lateral boundaries of archen- | Smallmyocoels in anterior three | cavity in somite. Entoderm and 
| teron indicated externally by ridges. | somites. mesoderm confluent behind this 
| Deep median furrow extends forward | enlargement. 
| to middle of cephalic plate. | 
TRRr@. Embryo |Fixative: Chromo-acetic. Tail swelling more definitely marked | Nine pairs of fully formed so- A distinet cavity in mandibular 
1354 2.5 mm. |Section: Transverse, 6 y. off laterally from blastodermic rim  mites. The anterior eight pos- |somite. Head mesoderm extends 
Stain: Iron haematoxylin, than in preceding embryo. Lateral sess definite myocoels. An- alittle farther ventrally along sides 
orange G, and Sudan III. boundaries of archenteron appear as |terior somites slightly con- | of archenteron. Preoräl mesoderm 
| | distinct ridges on blastoderm, ex- |stricted ventrally. distinct from entoderm. 
| | tending from fifth pair of somites to 
| lateral boundaries of tail swellings. 
| 
H.E.C. Embryo |Fixative: Aceto-corrosive. Much as preceding embryo (No. 8), | Ten pairs ofsomites, aneleventh | Mandibular somite expanded dor- 
997 | 2.7 mm. Section: Transverse, 6 ». except for medullary plate (see brain |in process of formation pos- |sally, connected with the general 
| Stain: Borax carmine, safranin. | and cephalic nerves). teriorly. Anterior somites have mesoderm by a broad posterior 
a much greater antero-posterior stalk. Hyoid somite represented 
| diameter than posterior ones. |by a dorsal enlargement of this 
stalk. Cells of preoral mesoderm 
have an epithelial arrangement. 
HE: Embryo Fixative: Aceto-corrosive. Anterior half of cephalic part of em- | Twelve pairs of somites (coun- | Mandibular somite marked off from 
IOII 3.I mm. ‚Section: Transverse, 6 u. bryo separated from blastoderm, and | ted from sections). No myocoel | posterior mesoderm by deep groo- 
Stain: Borax carmine, safranin. | bent sharply ventrally. in two posterior pairsofsomites. | ves. Lumen enlarged. Preoral 
Mesial and lateral walls of equal | mesoderm more distinct from ento- 
thickness. derm of foregut than before. 
ErBrEI Embryo |Fixative: Aceto-corrosive. Anterior third of embryo separated Eleven or twelve pairs of so- | Much as preceding embryo (No. 10). 
978 3.2 mm. |Section: Transverse, 6 ». from blastoderm. Head turned to mites (counted from sections). 
Stain: Borax carmine, orange G. 
| 
right, and a little ventrally. Caudal 
swellings project abruptly from blasto- 
dermic rim, extending backward 
0.5 mm. over yolk. 
u 
Fe REN TER EN FRE 28 
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